Node Movement Detection to Overcome False Route Failures in Mobile Ad Hoc Networks

The mobile ad hoc network (MANET) is a wireless network without the wired infrastructure such as base stations in which mobile nodes communicate via multiple wireless links. In the MANET, route failures may happen because of node movement or wireless link collisions on routes. Since route failures due to wireless link collisions (i.e., false route failures) are not from network topology changes, they should not trigger route reestablishments; otherwise, the network performance will be aggravated. In this paper, we propose a node movement detection scheme that can prevent unnecessary route reestablishments caused by false route failures in the MANET. The proposed mechanism allows a node to decide its movement based on the reception status of modified HELLO messages which indicates the degree of its local topology changes. By carrying out NS-2 based simulations, we show that our node movement detection scheme resolves the false route failure problem more effectively than the existing mechanisms.